Elements, Compunds and Mixtures
Our Earth
The Periodic Table
Chemistry Madness
Chemical Equations
100
Al , Cu , N , O , are all symbols for ___
What is an element
100

What are the four main elements that make up all of living matter on Earth.

What are: Carbon, Hydrogen, Oxygen and Nitrogen

100
What is arranged on the periodic table?
Elements
100
Substances in a mixture can be separated by physical means because
no chemical change has happened
100
What is happening in the chemical equation 2H2 + O2 ---> 2H2O
The compound water is being made
200
When two or more substances are mixed but not chemically combined, they form a
What is a mixture
200
The atmosphere of the Earth is comprised mostly of oxygen and
What is nitrogen
200
Na is the ____________ ______________ for sodium.
What is a chemical symbol.
200
A substance that cannot be changed into simpler substances by a chemical change is __.
an element
200
The smallest particle of any particular type of matter.
What is an atom.
300
Carbon is considered an element while carbon dioxide is considered a compound. This is because carbon dioxide is–
contains 1 carbon atom and two oxygen atom.
300
Of the following 3 elements, which is a metalloid - Si, Na, Cl.
Silicon
300
The number shown on the top part of each of the element squares in a periodic table is the
the atomic number
300
A substance that contains only one kind of atom is called___.
What is an element
300
What can you change in an equation when balancing both sides?
the coefficient (the number in front of the element or compound)
400
How many elements are in the compound Fe2O3?
2 elements
400
The number of electrons in the outermost energy level are called the ______ electrons.
Valence
400
The vertical rows are called ____________ and the horizontal groups are called _____________.
What are groups and periods.
400
Which of the following can be broken down into simple substances by chemical but not physical means?
What is a compound
400
A balance chemical equation shows that in any chemical reaction:
atoms are rearranged, not created nor destroyed
500
The smallest part of a compound that still acts like that compound is ___.
a molecule
500
Why is the oxygen that makes up the atmosphere found as an element, but in the Earth and in the ocean it is found as a compound? Think in terms of the state of matter of the oxygen in each situation.
In the atmosphere oxygen exist as a gas, where the particles of matter are far apart. In the solid Earth and in the ocean, oxygen exists as a solid or a liquid, where the particles of matter are closer together and are more likely to form compounds.
500
Name the three parts the periodic table is divided into.
metals, non-metals and metalloids
500
An unknown, clear liquid is given to you in a beaker. You transfer the liquid from the beaker to a clean, empty test-tube, and begin to heat it. After a while, you see vapours (which on further analysis you discover are vapours of water) rising from the test-tube, and pretty soon, all that's left are a few crystals of salt stuck to the edges! Was that liquid an element, compound or a mixture?
What is a mixture
500
To have a balanced equation you must have:
the same amount of matter and atoms on each side of the equation.
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